Sound-reproducer for graphophones.



' PATENTED .001". s, 1907.

. W- HART. SOUND RBPRODUGER FOR GRAPHOPHONBS.

APPLICATION FILED MAY 4. 1907.

N 3 0 IA HH 7 i 0 uwv I 5mm WILLIAM alibiueqo 1 khaki 8, and to the opposite end is secured an upwardly pro- WILLIAM HART, osKInKsvILLE, MISSOURI.

SOUND-REPRODUCER FOR GRAPHOPHONES.

Specification of Letters Patent.

Patented Oct. s',1 9o7.

Application filed 35:17 4, 1907. Serial No. 371,928.

To all whom it may concern:

Be it known that I, WILLIAM HART, a citizen of the U nitcd States, residing at Kirksville, in the county of Adair and State of Missouri, have invented certain new and useful Improvements in Sound-Reproduccrs ,for Graphophones; and I do declare the following to be a full, clear, and exact description of the invention, such as will enable others skilled in the art to which it appertains to make and use the same.

- This invention relates to improvements in sound rcprodncers for graphophones, and the like.

The object of the invention is to provide a device of this kind by means of which the volume of sound will be greatly increased and made more clear and distinct.

With this object in view, the invention consists of certain novel features of construction, combination and arrangement of parts as will be more fully described and particularly pointed out in the appended claims.

In the accompanying drawings, Figure 1 is a side w'ew of a sound reproducerconstructed in accordance with the invention; and Fig. 2 is a bottom plan view of the same.

Referring more particularly to the drawings, 1 denotes a portion of the frame of the graph'ophone to which M the rcproducer is attached. 0n the frame 1 is arranged a sleeve or collar 2 in which is adjustably mounted the lower reduced end of the horn, or sound-transmission device, 3, said end being secured in the collar 2 by means of a set screw 4. Pivotally mounted on the lower end of the horn 3 is a diaphragm plate 5, said plate being provided with'an inwardly projecting tubular boss 6, which is adapted to be inserted 'in the lower end of the horn 3, and is pivotally connected to said end by pivot studs or pins, 7. 7

On the lower side of one end of the plate 5 is a weight jecting arm or bar 9, which is adapted to work through a slot or passage, 10, in the frame l, as shown. The upperend of the arm 9 is bent at right angles, and to said bent end is connected the upper end of a counterbalancing-spring 12,the lower end of which is connected [to the frame 1. The spring 12 is here shown a light coil spring, the tension of which is exerted to counterbalance the weight 8 arranged on the opposite end of the diaphragm plate 5'. The plate 5 is substantially triangular in shape and is provided with a plurality of circular openings, 13, three of which are shown in the present instance, and is the prefeifdnumber employed. In the openings 13 are arranged diaphragms 14, which may be formed of any suitable material, but which are preferably formed for thin sheetsoi aluminium.

On the underside of the platd 5 adjacent tothe weighted end of the same is formed a downwardly projocting centrally disposed bearing'stud, I4,the lower end of which is bifurcated and adaptedto receive the inner end of a record engaging lever 15, said lever being pivoted in the stud14 by a pivot pin 16. The lever 15 is reduced in thickness substantially midway be-". tween its ends to form a spring construction for the'in-.

ner pivoted end of the lever, whereby the point 17 on the outer end of the lever may readily engage and follow the grooves on the record.

Formed on the upper edge of the inner portion of the lever 15 is an upwardly projecting bearing point 15 upon which is mounted a thin aluminiumtransmission disk, 19, by means of which the vibrations or movements of the lever 15, caused by its engagement with the grooves in the record, are transmitted to the dia-' phragms 14 in the plate 5. The disk 19 is provided on made more clear and distinct The sound vibrations from the diaphragms are conducted through the tubular boss 6 into ,the sound transmitting horn, where it is further amplified and increased in volume.

Connected to the underside of the plate 5, and adapt ed to bear upon the inner end of the lever 15, is a light spring 21 which is adapted to hold the lever 15 in position to support the transmission disk, 19, in engagement with the diaphragms when the outer end of the lever is not in engagement with or supported by the record. The spring 12 connected to the arm 9 on the end of the lever 15 is adapted to counterbalance the weight 8 at the opposite end of the plate 5 and force the point 17 on the outer end of the lever 15 dowirwardly into engagement with the grooves on the record.

From the foregoing description, taken in connection with the accompanying drawings, the construction and operation of the invention may be readily imderstood without requiringa more extended explanation.

Various changes in the form, proportion and. the

minor details of construction may be resorted to without departing from the principle or sacrificing any of the advantages of this invention as defined in the appended claims.

Having fully described my invention, What I claim as new and desire to secure byLctters-Patent, is:

1. A' sound reproducer for graphophones, comprising a pivotally mounted diaphragm plate, diaphragms arranged insaid plate, a record engaging: lever pivotally mounted on said plate, and a transmission disk supported by said lever and held in engagement with said (liupln'agms, sub stantlally as described.

2. X sdiurd reproducer for graphophones, comprising a iii) 'horn. a diaphragm plate pivotnlly mounted on the lower ally mounted to the underside of'sald plnte a sound trans:

end 61" said horn, said plate having formed therein 21 plurnlity of diaphragm openings, a plurality of diaphrngms arranged in said openings, 1 record engaging lever pivotmission disk supported by said lever and held. thereby in operative engagement with said dinphr:1gm's,n record engaging point on the outer end of said lever, and meansto .foree thdatter downwardly to engage said point with the grooves on the record, substantially-es described.

mounted on the lower end of said hr 4. A sound reproducer for graphophones, comprising a horn, means to zidjustnbly secure the end thereof in the 'frame of the graphophone, a diaphragm plate pivotally t sail nintw iuirlnzr formed therein a plurality of (imminent vl tlllll 'phragms in said openings, :1 weight tillfltl in one end of said plate, a connterbulnnein; spriinr win ivt'twl in the other end thereof, a pivot stud on illt under I of .snl'l plutefn spring record engaging lever pimtnl y timmlieil in 1-. tw n said stud, a record engaging point on the outenvnd of said lever, a bearing pin arranged upon the inner portion of the lever, a sound transinittim, disk supported upon mid bearing pin, diaphragm engaging points on snid disk and adapted to be engaged with the dinplirngnn; in snid plate, and :1 spring to support. said lever and dish when the former is disengaged from the record, substantially us described.

In testimony whereof I have hereunto set my h nd in presenec of two subscribing witness WILLIAM HA Rl.

liitnesses H. A. HART, T. J. Wnrrz'mn. 

